A complete Cambodia ring measurement guide for 2026 โ measure your finger or an existing ring, calculate the closest US size, compare EU/ISO and UK conversions, and shop more confidently in Phnom Penh, Siem Reap or online.
Use millimetres whenever possible. A paper-strip measurement gives finger circumference, while measuring a comfortable ring gives inner diameter. The calculator converts either measurement into the ring-size systems commonly shown by Cambodian and international sellers.
Measure the finger and hand where the ring will be worn. Different fingers and hands can require different sizes.
Wrap non-stretch paper around the base of the finger. Keep it comfortably snug and make sure it can pass the knuckle.
Mark the overlap, lay the strip flat and measure the length in millimetres. This number is the finger circumference.
Enter the measurement below to see the nearest US size plus EU/ISO, approximate UK and exact dimensions.
Example: 5.45 cm circumference becomes 54.5 mm.
Example: 17.3 mm diameter becomes 1.73 cm.
Example: 17.3 mm ร 3.1416 โ 54.3 mm.
Example: 54.3 mm รท 3.1416 โ 17.3 mm.
Often written as US 6, US 6.5 or US 7. Confirm the label.
A 54 mm inner circumference is commonly shown near EU/ISO 54.
| US Size | Inner Diameter (mm) |
Inner Circumference (mm) |
EU / ISO Approx. |
UK Size Approx. |
Diameter (inches) |
Circumference (inches) |
|---|
Conversion charts are practical estimates, not a replacement for the seller's own gauge. Half-size equivalence can vary slightly because systems use different increments and manufacturers allow tolerances. For a valuable engagement ring, wedding band or wide ring, confirm the final size with the jeweller who will make or sell it.
A ring finger on the left hand may not match the same finger on the right hand. Decide where the ring will be worn before measuring. For engagement or wedding rings, also consider whether two bands will sit together, because a stacked set can feel tighter than a single narrow ring.
Cut a narrow strip of ordinary paper. Do not use elastic thread, soft yarn or material that stretches when pulled. Wrap the strip around the finger base so it touches the skin without compressing it. The loop must still pass over the knuckle with gentle resistance.
Use a thin line rather than a thick marker. Lay the strip completely flat and measure from its starting edge to the mark in millimetres. The measured length is the finger circumference. Enter that number into the calculator using โFinger Circumference in MMโ.
Finger fit can change temporarily with heat, activity, hydration and time of day. Cambodia's warm climate makes it especially useful to measure when your hands feel normalโnot immediately after strenuous exercise, prolonged sun exposure, a cold air-conditioned environment or a very hot shower.
Keep a note such as โUS 7 / approximately 54.4 mm circumference / 17.3 mm diameter.โ The dimensions make it easier for a Phnom Penh jeweller, overseas website or custom goldsmith to verify the intended size even when a different naming system is used.
Do not use a ring worn on another finger unless you know both fingers are the same size. Select a round ring that sits comfortably and passes the knuckle without pain.
Place the ring flat on a ruler. Measure straight across the widest inside point through the centre. Do not include the metal. A calliper gives a more precise result than a thick or worn ruler.
Turn the ring approximately 90 degrees and repeat. If the readings differ, the ring may be oval or the ruler may not have crossed the true centre. Use the average only for a rough estimate; a jeweller can check an out-of-round ring more reliably.
The calculator will select the closest US half size and display the matching dimensions and approximate international equivalents. Show both the result and measured diameter to the seller.
Print this page at 100% or โActual Sizeโ. Do not select โFit to Pageโ, โShrinkโ or automatic scaling. After printing, the line below should measure exactly 50 mm with a physical ruler. If it does not, do not trust any printed ring circles or strip measurements from that printout.
Hands may feel fuller during hot conditions. Use several readings rather than one extreme measurement.
The ring must pass the knuckle but remain secure at the base. Professional fitting is useful when the difference is large.
A wide wedding band covers more skin than a narrow ring and may need a different fitting decision.
Do not assume the same named finger on both hands has an identical circumference.
Elastic string can change length while measuring and produce a misleading result.
Full-eternity stones, engraving and some metals can limit later resizing.
Before paying a deposit or submitting an online order, ask the seller to name the system. โSize 7โ usually suggests a US number, but assumptions are risky when jewellery moves between Cambodia, Thailand, Singapore, China, Europe, Australia, the United Kingdom and the United States. Ask the shop to confirm the corresponding inner diameter or circumference in millimetres.
A local goldsmith can work more confidently when you provide the exact finger measurement as well as the converted label. For example: โThe finger circumference is 54.5 mm; the calculator estimates US 7.โ A professional may still use a finger-gauge set to adjust for the band width, ring profile and wearer preference.
Expensive rings deserve a second verification. Measure on different days, compare a correctly fitting existing ring when possible, and ask whether the finished design can be resized. Rings covered with stones around the full circumference are often more difficult to alter than a plain band.
Imported rings may take time to return from Cambodia, and custom sizes may be excluded from ordinary return policies. Keep screenshots of the seller's chart, save your submitted size, and confirm who pays for resizing or international shipping if the fit is wrong.
There is no reliable national measurement that can replace the wearer's actual finger size. Body build, finger shape, knuckle size, hand dominance, band width and comfort preference all matter. An average can be a rough surprise-gift guess, but it is not accurate enough for an important ring.
Ring size
Inside diameter
Finger circumference
Please confirm the sizing system.
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แแ โ ring size
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แแ โ ring
When accuracy matters, showing the written millimetre measurement is safer than relying only on translated terminology.
Jewellery customers in Cambodia can encounter several ring-size labels in a single shopping journey. A local designer may work in US sizes, an imported European product may use a number close to the inner circumference in millimetres, an Australian or British website may use letters, and a marketplace listing may provide only diameter. These labels can describe almost the same physical ring but look completely different. A conversion page is therefore most useful when it begins with the real measurementโthe inner circumference or diameterโrather than treating any one label as universally Cambodian.
Finger circumference is the distance around the finger where the ring will sit. It is measured with a flexible but non-stretch strip. Inner ring diameter is the straight-line distance across the empty opening of a ring, measured through the centre. Circumference is roughly 3.1416 times the diameter. Confusing these two numbers can cause a very large ordering error, so always label the measurement clearly.
Centimetres are convenient for ordinary rulers, but ring sizes change over very small intervals. Writing 54.4 mm is clearer than 5.44 cm and reduces misplaced decimal points. The ISO ring-sizing framework is based on defined measurement and designation methods, while many international charts relate EU/ISO-style labels to inner circumference in millimetres. Even when the Cambodian seller uses US numbers, millimetres remain a useful verification.
A correctly fitted ring should remain secure during normal hand movement. It should pass over the knuckle with light resistance and settle comfortably at the finger base. It should not cause numbness, pain or a deep persistent mark, and it should not slide off when the hand is relaxed. Some rotation is normal for top-heavy rings, but continuous spinning may indicate an overly loose fit or a design that needs sizing beads or another professional solution.
Because many parts of Cambodia are warm for much of the year, avoid choosing a size from a single reading taken when the hand is unusually cold in strong air conditioning. Equally, do not measure immediately after exercise or when the fingers feel temporarily swollen. Three readings under ordinary conditions provide a better starting point. When a result sits exactly between sizes, discuss the band width and preferred fit with the seller instead of automatically applying one rule to every design.
For a surprise ring, borrow a ring that the recipient actually wears on the intended finger. Measure its inner diameter at the centre, or take it discreetly to a jeweller. A ring from the wrong finger can be misleading. A trusted friend or family member may know the size, but ask them whether it is US, UK, EU/ISO or another system. When uncertainty remains, choose a design that can be resized and confirm the jeweller's policy before purchase.
Home measurement is useful for narrowing the range, comparing online charts and communicating with sellers. Professional jewellers use calibrated gauges and can account for wide bands, tapered shanks, comfort-fit interiors, large knuckles, bridal sets and unusual ring construction. For a high-value ring or a design that is difficult to resize, professional sizing should be treated as the final confirmation.
These external references support the measurement method, international terminology and Cambodia-specific sizing context: